fix(scrollBehavior): trigger scroll behavior if same route

close vuejs#1668, vuejs#974

Author: Ryan Klarhölter

src/history/base.js

@@ -20,6 +20,7 @@ import {
   isNavigationFailure,
   NavigationFailureType
 } from '../util/errors'
+import { handleScroll } from '../util/scroll'
 
 export class History {
   router: Router
@@ -161,6 +162,7 @@ export class History {
       route.matched[lastRouteIndex] === current.matched[lastCurrentIndex]
     ) {
       this.ensureURL()
+      handleScroll(this.router, current, route, false)
       return abort(createNavigationDuplicatedError(current, route))
     }